- Under the tree, happily, played, the children.
- The children played under the tree happily.
- Under the tree played the children happily.
- Happily played the children under the tree.
The correct sentence structure in English is Place-Subject-Adverb-Verb. The place (under the tree) should come first, followed by the subject (the children), the adverb (happily), and finally, the verb (played). The correct option (b) follows this structure.
